Re: image service?
I wrote an engine service which we use for dynamic thumbnailing/resizing. It's really great because you simply say the dimensions and it resizes them. Also, we set up short urls for the service so the thumnails are browser cached. If you would like it as a reference you can email me and I'll send it to you. It's tied into our own Image class which stores the images as a byte[] but it should be a good reference for doing the aspect ratio stuff and all that. Let me know if you would like it. On Sun, 2006-06-11 at 00:47 -0400, Henri Dupre wrote: I seem to recall that quite a while ago someone was working on an image service. I would need a service that allows to resize pictures (hopefully cache the images). Has anyone developped such service? Thanks, Henri. -- Dan Adams Software Engineer Interactive Factory 617.235.5857 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: image service?
I have a simple image service which is not very well packaged, but depends on an Image class, and uses the trails frameworks Hibernate DAO to get and do stuff to images stored as byte[]s in the Image class. Could any of that be of use? I don't think you would need to use trails at all, really, since it's only one line which uses the getPersistenceService() Cheers, PS On 6/11/06, Henri Dupre [EMAIL PROTECTED] wrote: I seem to recall that quite a while ago someone was working on an image service. I would need a service that allows to resize pictures (hopefully cache the images). Has anyone developped such service? Thanks, Henri.
Re: image service?
On 11. Jun 2006 - 10:11:00, Peter Svensson wrote: | I have a simple image service which is not very well packaged, but depends | on an Image class, and uses the trails frameworks Hibernate DAO to get and | do stuff to images stored as byte[]s in the Image class. Could any of that | be of use? I'd also be interested in it ;-) Andreas - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: image service?
This is embarrasing. It's really not much, and not very well written. On the
other hand I ported it fairly easy to another project by changing class
names and lookup so I suppose you could do the same. I'm not doing any
java2D magic in it though, just passing a byte[] as an image/jpeg to the out
stream from the defined object;
In my ImageEdit.html I have;
img jwcid=@Any src=ognl:url width=ognl:model.width height=ognl:
model.height/
And in the coresponding ImageEdit.java I have ;
public String getUrl()
{
Picture sp = (Picture)getModel();
System.out.println(StoredPictureEdit getCurrentUrl pic is +sp);
System.out.println(StoredPictureEdit getCurrentUrl pic id is +sp);
Integer id = sp.getID();
return /Art/app?service=imageimageid= + id ;
}
Where model is the current object in trails. You could easily just change
this to any getter for the class contatining a byte[] for the pciture you
want to show. Not that I have chickened out on the link generation
department. Works great, though.
Then I define my ImageService in a hivemodule.xml I just put in a META-INF
directory directly under my /src directory;
?xml version=1.0?
module id=model version=1.0.0
service-point id=ImageService interface=
org.apache.tapestry.engine.IEngineService
invoke-factory
construct
class=ImageService/
/invoke-factory
/service-point
contribution configuration-id=tapestry.services.ApplicationServices
service name=image object=service:ImageService/
/contribution
/module
The comes the fairly half-and again not really longish ImageService.java;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.IEngineService;
import org.apache.tapestry.engine.ILink;
import org.trails.persistence.PersistenceService;
public class ImageService implements IEngineService
{
private HttpServletResponse response;
private String TYPE=jpeg;
private int imgid;
public void setResponse(HttpServletResponse response)
{
this.response = response;
}
public String getName()
{
return image;
}
public void service(IRequestCycle cycle) throws IOException
{
System.out.println(ImageService called);
String id = cycle.getParameter(imageid);
imgid = Integer.parseInt(id);
System.out.println(ImageService id == '+imgid+');
Picture sp = getImage();
byte[] raw = sp.getPicdata();
OutputStream os = response.getOutputStream();
os.write(raw);
os.close();
}
public Picture getImage()
{
Picture rv = null;
List tmp = null;
Class arg0 = null;
try
{
arg0 = Class.forName(Picture);
}
catch (ClassNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
PersistenceService ps = PictureEdit.getRefrence
().getPersistenceService();
Picture s = (Picture) ps.getInstance(arg0, imgid);
System.out.println(ImageService Object from persistence is +s);
rv = s;
return rv;
}
public ILink getLink(boolean post, Object parameter)
{
return null;
}
public ILink getLink(IRequestCycle arg0, boolean arg1, Object arg2)
{
// TODO Auto-generated method stub
return null;
}
}
And as I said, the main part to change here is the part in getImage where
you get a persisitenceService from some kind of Hibernate manager to
actually read the object referred to in the service HTTP argument.
Not much to it, really. Please use any or all if you can .
Cheers,
PS
On 6/11/06, Andreas Bulling [EMAIL PROTECTED] wrote:
On 11. Jun 2006 - 10:11:00, Peter Svensson wrote:
| I have a simple image service which is not very well packaged, but
depends
| on an Image class, and uses the trails frameworks Hibernate DAO to get
and
| do stuff to images stored as byte[]s in the Image class. Could any of
that
| be of use?
I'd also be interested in it ;-)
Andreas
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Re: image service?
Thanks alot Peter! Yes that would definitely save me time. I'm planning to save the images in files and I'd like my service to get dimentions and do some java 2d magic. How well does it perform to store all the images in the DB? On 6/11/06, Peter Svensson [EMAIL PROTECTED] wrote: And as I said, the main part to change here is the part in getImage where you get a persisitenceService from some kind of Hibernate manager to actually read the object referred to in the service HTTP argument. Not much to it, really. Please use any or all if you can . Thanks, Henri.
Re: image service?
I have only used it for a small number of images, actaully. Also, there's a problem with transferring files larger than 1MB. I have not noticed any lags for ~10 images on a page that is served by this method as compared to putting them on a nearby apache or as static assets. Cheers, PS On 6/11/06, Henri Dupre [EMAIL PROTECTED] wrote: Thanks alot Peter! Yes that would definitely save me time. I'm planning to save the images in files and I'd like my service to get dimentions and do some java 2d magic. How well does it perform to store all the images in the DB? On 6/11/06, Peter Svensson [EMAIL PROTECTED] wrote: And as I said, the main part to change here is the part in getImage where you get a persisitenceService from some kind of Hibernate manager to actually read the object referred to in the service HTTP argument. Not much to it, really. Please use any or all if you can . Thanks, Henri.
Re: image service?
| That would be *exactly* what I need... Do you have any pointers to | Stiches? | Is that a tapestry framework?? - http://stitches.authsum.org/ Cheers, Andreas - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: image service?
This might help you with image resizing. It was built for a very
specific purpose: take an input image, downsize it to fit a specified
maximum width and output it as a JPEG. It could easily be extended to
work with a maximum height as well (typical thumbnail bounding box
approach). The useful thing in this code is that it demonstrates how to
get good quality resized JPEG's (something people seem to have a lot of
trouble with using awt imaging). This is the guts of the service with
all the image processing code.
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import org.apache.tapestry.ApplicationRuntimeException;
public class ImageService {
public static final float JPEG_COMPRESSION_RATIO = 0.90f;
public static void saveConstrainedJpeg(InputStream input, int
maxWidth, File outFile) {
// Read source file into a BufferedImage.
BufferedImage inputImage;
try {
inputImage = ImageIO.read(input);
} catch (IOException ex) {
throw new ApplicationRuntimeException(Cannot read image
file., ex);
}
// Get input image width and height.
int imgWidth = inputImage.getWidth();
int imgHeight = inputImage.getHeight();
// Write the original image if it is within the given constraints.
if (imgWidth = maxWidth) {
writeJpeg(inputImage, outFile);
return;
}
// Calculate new width and height;
double factor = (double) maxWidth / imgWidth;
int newWidth = (int) Math.round(factor * imgWidth);
int newHeight = (int) Math.round(factor * imgHeight);
// Create and save target image.
BufferedImage target = new BufferedImage(newWidth, newHeight,
BufferedImage.TYPE_INT_RGB);
writeJpeg(resize(inputImage, target), outFile);
}
private static BufferedImage resize(BufferedImage source,
BufferedImage target) {
Graphics2D g2 = target.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
double scalex = (double) target.getWidth() / source.getWidth();
double scaley = (double) target.getHeight() / source.getHeight();
AffineTransform at = AffineTransform.getScaleInstance(scalex,
scaley);
g2.drawRenderedImage(source, at);
g2.dispose();
return target;
}
private static void writeJpeg(BufferedImage image, File outFile) {
// Find a jpeg writer.
ImageWriter writer = null;
Iterator iter = ImageIO.getImageWritersByMIMEType(image/jpeg);
while (iter.hasNext()) {
writer = (ImageWriter) iter.next();
}
// Prepare the output file.
ImageOutputStream ios = null;
try {
ios = ImageIO.createImageOutputStream(outFile);
} catch (IOException ex) {
throw new ApplicationRuntimeException(Could not open file
for output., ex);
}
writer.setOutput(ios);
// Set the compression quality.
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality(JPEG_COMPRESSION_RATIO);
// Write the image.
try {
writer.write(null, new IIOImage(image, null, null), param);
ios.flush();
writer.dispose();
ios.close();
} catch (IOException ex) {
throw new ApplicationRuntimeException(Could not write image
file., ex);
}
}
}
-Ryan
Henri Dupre wrote:
I seem to recall that quite a while ago someone was working on an image
service.
I would need a service that allows to resize pictures (hopefully cache
the
images). Has anyone developped such service?
Thanks,
Henri.
-
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For additional commands, e-mail: [EMAIL PROTECTED]
